1 Method

Raw isoform-level counts were obtained from lr-kallisto (v0.51.1) and imported into R as a counts matrix. To ensure robust statistical analysis, transcripts were filtered to retain only those with at least 10 counts in two or more samples.

Differential isoform expression analysis was performed using the DESeq2 (v1.44.0) package. The design matrix incorporated disease status (AD vs. CTRL) as the primary factor while adjusting for sex as a covariate.

Results were annotated by joining transcript IDs to gene symbols using a reference transcript-to-gene mapping file generated from GENCODE v48 human reference genome, transcriptome, and annotated GTF files. Significantly differentially expressed isoforms were filtered by adjusted p-value < 0.05 and fold-change threshold (log2 fold-change ≥ |log2(1.5)|). Volcano plots highlighting significant isoforms were generated in ggplot2 (3.5.3).

Significant isoforms were further explored by plotting normalized counts across conditions and stratified by sex to visualize expression differences. Finally, principal component analysis (PCA) on variance-stabilized transformed counts was performed to assess sample clustering by condition and covariates.

1.1 All analyses were conducted in R (v4.4.0) and tidyverse (v2.0.0) ecosystem packages.

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2 Raw Counts

# read in raw counts matrix
counts <- read.csv("../kallisto_counts/kallisto_isoform_counts_all.csv")

counts

3 Filter Counts

Keep transcripts with at least 2 samples that have ≥ 10 counts

# filter counts to keep transcripts with at least 2 samples with counts >= 10

# all columns to integers
counts[ , -1] <- lapply(counts[ , -1], as.integer)

counts_filtered <- counts[rowSums(counts[-1] >= 10)>= 2, ]

counts_filtered

4 Run DESeq2

# create deseq2 object

# counts matrix
counts_matrix <- as.matrix(counts_filtered[-1])
row.names(counts_matrix) <- counts_filtered$isoform_id

4.1 Covariate Data for DESeq2

# col data
col_data <- tibble(
  sample_name = colnames(counts_filtered[-1])) %>%
  separate(sample_name,c("sample","condition"),sep="_",remove=FALSE) %>%
  mutate(condition=as.factor(condition))

# add other covariates for pca
col_data$sex <- factor(c('male','male','male','female','female','female','male','female'))
#col_data$race <- factor(c('Black','Black', 'White', 'White', 'White','White','Black','Black'))

col_data

4.2 Design Formula

# design matrix and dds object
design <- formula(~ condition + sex)
design
## ~condition + sex

5 Add Gene Names to Differential Expression Results

# add gene names

t2g_file <- readr::read_delim("../../refs/human.t2g", delim = "\t", col_names = c("transcript_id", "gene_id", "gene_symbol", "gene_version", "chr", "start", "end", "strand")) %>%
  dplyr::select(transcript_id, gene_symbol)

res_df <- res %>%
  as.data.frame() %>%
  arrange(padj) %>%
  tibble::rownames_to_column("isoform_id") %>%
  inner_join(t2g_file, by = join_by(isoform_id == transcript_id)) %>%
  dplyr::select(isoform_id, gene_symbol, everything())

res_df
write.csv(res_df, "kallisto_differential_isoform_expression.csv", row.names = FALSE)

6 Volcano Plot of Differentially Expressed Isoforms [Labelled with Gene Name]

Padj threshold = 0.05 Log2FC threshold = +/- 1.5

7 Individual Isoform Count Plots by Condition and Sex

# plot sample counts for significant differentially expressed isoforms

significant_isoforms <- res_df %>% 
  dplyr::filter(padj < 0.05) %>% 
  pull(isoform_id)

run_plot_counts <- function(dds, iso_id) {
  
  gene_name <- res_df %>% 
    dplyr::filter(res_df$isoform_id == iso_id) %>% 
    pull(gene_symbol)
  
  plot_data <- plotCounts(dds, iso_id, intgroup = c("condition", "sex"), returnData = TRUE)

  p <- plot_data %>%
    ggplot(aes(x=condition, y=count, color = sex)) + 
    geom_point(position=position_jitter(w=0.1,h=0)) + 
    ggtitle(paste0(gene_name, " (", iso_id, ")")) +
    theme_minimal()

  print(p)
}

for (isoform in significant_isoforms) {
  run_plot_counts(dds,isoform)
}

8 PCA on VST-Normalized Counts

# pca
vsd <- vst(dds, blind=FALSE)

plotPCA(vsd, intgroup=c("condition"))

plotPCA(vsd, intgroup=c("sex"))

plotPCA(vsd, intgroup=c("condition", "sex"))

---
title: "pacbio_ad_pilot_differential_isoform_expression_kallisto_counts"
author: Rachel Bozadjian
date: 8/6/25
output: 
  html_document:
    code_folding: show
    code_download: true
    df_print: paged
    theme: yeti
    highlight: tango
    toc: yes
    toc_float:
      collapsed: false
      smooth_scroll: false
    number_sections: true
---

# Method

Raw isoform-level counts were obtained from lr-kallisto (v0.51.1) and imported into R as a counts matrix. To ensure robust statistical analysis, transcripts were filtered to retain only those with at least 10 counts in two or more samples.

Differential isoform expression analysis was performed using the DESeq2 (v1.44.0) package. The design matrix incorporated disease status (AD vs. CTRL) as the primary factor while adjusting for sex as a covariate.

Results were annotated by joining transcript IDs to gene symbols using a reference transcript-to-gene mapping file generated from GENCODE v48 human reference genome, transcriptome, and annotated GTF files. Significantly differentially expressed isoforms were filtered by adjusted p-value \< 0.05 and fold-change threshold (log2 fold-change ≥ \|log2(1.5)\|). Volcano plots highlighting significant isoforms were generated in ggplot2 (3.5.3).

Significant isoforms were further explored by plotting normalized counts across conditions and stratified by sex to visualize expression differences. Finally, principal component analysis (PCA) on variance-stabilized transformed counts was performed to assess sample clustering by condition and covariates.

## All analyses were conducted in R (v4.4.0) and tidyverse (v2.0.0) ecosystem packages.

```{r}
library(AnnotationDbi)
library(DESeq2)
library(EnsDb.Hsapiens.v86)
library(ggrepel)
library(knitr)
library(tidyverse)

knitr::opts_chunk$set(echo=TRUE, warning=FALSE, message=FALSE, fig.width=12, fig.height=8, fig.align = "center")
```

```{r}
sessionInfo()
```

# Raw Counts

```{r}
# read in raw counts matrix
counts <- read.csv("../kallisto_counts/kallisto_isoform_counts_all.csv")

counts
```

# Filter Counts

Keep transcripts with at least 2 samples that have ≥ 10 counts

```{r}
# filter counts to keep transcripts with at least 2 samples with counts >= 10

# all columns to integers
counts[ , -1] <- lapply(counts[ , -1], as.integer)

counts_filtered <- counts[rowSums(counts[-1] >= 10)>= 2, ]

counts_filtered
```

# Run DESeq2

```{r}
# create deseq2 object

# counts matrix
counts_matrix <- as.matrix(counts_filtered[-1])
row.names(counts_matrix) <- counts_filtered$isoform_id
```

## Covariate Data for DESeq2

```{r}
# col data
col_data <- tibble(
  sample_name = colnames(counts_filtered[-1])) %>%
  separate(sample_name,c("sample","condition"),sep="_",remove=FALSE) %>%
  mutate(condition=as.factor(condition))

# add other covariates for pca
col_data$sex <- factor(c('male','male','male','female','female','female','male','female'))
#col_data$race <- factor(c('Black','Black', 'White', 'White', 'White','White','Black','Black'))

col_data
```

## Design Formula

```{r}
# design matrix and dds object
design <- formula(~ condition + sex)
design
```

```{r, echo = FALSE}
# run deseq2
dds <- DESeqDataSetFromMatrix(
  countData=counts_matrix,
  colData=col_data,
  design=design
)
dds <- DESeq(dds)
res <- results(dds)
```

# Add Gene Names to Differential Expression Results

```{r}
# add gene names

t2g_file <- readr::read_delim("../../refs/human.t2g", delim = "\t", col_names = c("transcript_id", "gene_id", "gene_symbol", "gene_version", "chr", "start", "end", "strand")) %>%
  dplyr::select(transcript_id, gene_symbol)

res_df <- res %>%
  as.data.frame() %>%
  arrange(padj) %>%
  tibble::rownames_to_column("isoform_id") %>%
  inner_join(t2g_file, by = join_by(isoform_id == transcript_id)) %>%
  dplyr::select(isoform_id, gene_symbol, everything())

res_df
write.csv(res_df, "kallisto_differential_isoform_expression.csv", row.names = FALSE)
```

# Volcano Plot of Differentially Expressed Isoforms [Labelled with Gene Name]

Padj threshold = 0.05 Log2FC threshold = +/- 1.5

```{r, echo = FALSE}
padj_threshold <- 0.05
log2fc_threshold <- abs(log2(1.5))

# Get genes to label (significant & above FC threshold)
genes_to_label <- res_df %>%
  dplyr::filter(padj <= padj_threshold & abs(log2FoldChange) >= log2fc_threshold) %>%
  pull(isoform_id)

# Create gene_label column
res_df <- res_df %>%
  mutate(gene_label = if_else(isoform_id %in% genes_to_label, gene_symbol, NA_character_))

# Make volcano plot
volcano_plot <- res_df %>%
  ggplot(aes(x = log2FoldChange, y = -log10(padj))) +
  geom_point(color = "grey") +
  geom_point(data = subset(res_df, padj <= padj_threshold & log2FoldChange >= log2fc_threshold), color = "red") +
  geom_point(data = subset(res_df, padj <= padj_threshold & log2FoldChange <= -log2fc_threshold), color = "blue") +
  geom_text_repel(
    data = subset(res_df, !is.na(gene_label)),
    aes(label = gene_label),
    max.overlaps = Inf,
    box.padding = 0.7,
    point.padding = 0.25
  ) +
  geom_hline(yintercept = -log10(padj_threshold), linetype = "longdash", colour = "grey") +
  geom_vline(xintercept = log2fc_threshold, linetype = "longdash", colour = "red") +
  geom_vline(xintercept = -log2fc_threshold, linetype = "longdash", colour = "blue") +
  labs(
    title = "Volcano Plot of Differentially Expressed Isoforms [Gene Symbols]",
    x = "Log2 Fold Change",
    y = "-Log10(padj)"
  ) +
  theme_bw() +
  theme(plot.title = element_text(hjust = 0.5))

volcano_plot

res_df %>% dplyr::filter(!is.na(gene_label))
```

# Individual Isoform Count Plots by Condition and Sex

```{r}
# plot sample counts for significant differentially expressed isoforms

significant_isoforms <- res_df %>% 
  dplyr::filter(padj < 0.05) %>% 
  pull(isoform_id)

run_plot_counts <- function(dds, iso_id) {
  
  gene_name <- res_df %>% 
    dplyr::filter(res_df$isoform_id == iso_id) %>% 
    pull(gene_symbol)
  
  plot_data <- plotCounts(dds, iso_id, intgroup = c("condition", "sex"), returnData = TRUE)

  p <- plot_data %>%
    ggplot(aes(x=condition, y=count, color = sex)) + 
    geom_point(position=position_jitter(w=0.1,h=0)) + 
    ggtitle(paste0(gene_name, " (", iso_id, ")")) +
    theme_minimal()

  print(p)
}

for (isoform in significant_isoforms) {
  run_plot_counts(dds,isoform)
}
```

# PCA on VST-Normalized Counts

```{r}
# pca
vsd <- vst(dds, blind=FALSE)

plotPCA(vsd, intgroup=c("condition"))
plotPCA(vsd, intgroup=c("sex"))

plotPCA(vsd, intgroup=c("condition", "sex"))
```
